| 摘要 |
A heat exchanger comprises a first pipe (2; 20) and a second pipe (22) wound in respective essentially cylindrical spirals (3), and inside which respective fluids may circulate. The second pipe (22) is arranged inside the said first pipe (2; 20). The median diameter (D) of the first spiral (3) is greater than the median diameter (D') of the second spiral (33')· According to another aspect, the first pipe (2; 20) and the second pipe (22) have an essentially oval transverse cross-section. |
